One of my suggestions seems to be a subset of this one. So, whoever keeps track of these things might want to mentally add any upvotes that one gets to the parent, if they agree.

I think this would be a really neat addition, if done right. It would also lengthen the lifespan of some of the discussion threads, as they wouldn't constantly be pushed back by new, potentially irrelevant ones. (I, for one, rarely navigate beyond the first page, and there are only a few topics that I am interested in.)

This doesn't have to replace the main discussion area, by the way. It should be possible to implement viewing all the separate discussion topics on one page, but still provide the option of finer granularity for those who seek it.

Some additional, potential categories: LW Community Organizers (currently on a Google Group), Sequence Re-runs (currently strewn across the main discussion), Existential Risks, Radical Life Extension, AI Theory/Implementation, etc.